BirdAnalyst
Species · Connecticut · BBS 2025 Release · 1966–2024

House Finch Population Trend in Connecticut

All statesGeneralists

House Finch in Connecticut has surged: up 568% on the route-weighted index since 1969.

+568%Since 1969TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
20Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
55YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable House Finch Trends in ConnecticutNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

House Finch has surged in Connecticut: up 568% on the route-weighted index since 1969.

House Finch Population Forecast in Connecticut

If the recent trend holds, House Finch in Connecticut is projected to rise about 10% by 2029 — from 13 in 2024 to a central estimate of 14 (95% range 0.00–31). A 5-year backtest shows a typical error of ±45.6%, with 100% of held-out values landing inside the 95% band.

+10%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
14Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–3195% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±45.6%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, House Finch in Connecticut is projected to rise about 10% by 2029 — from 13 in 2024 to a central estimate of 14 (95% range 0.00–31). A 5-year backtest shows a typical error of ±45.6%, with 100% of held-out values landing inside the 95% band.19672029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
2025140.0031
2026140.0031
2027140.0031
2028140.0031
2029140.0031

House Finch Survey Routes in Connecticut

Routes recording House Finch in Connecticut.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Uncasville4920241977
New Hartford2619871979
Willimantic2520181976
E Hartland2119921978
Warren1920111978
Danbury1820231968
Mid Haddam1820241978
Southington1520241975
Westbrook1420241973
Mystic1320231974
Buckingham1320221976
No Woodbury920241972
Long Hill820191972
Sherman620191978
Greenwich420181967
Granby420241988
Woodstock 2320242017
Warren 2320242012
Woodstock120071984
New Hartford120211994

House Finch Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradodelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.